Produção de aflatoxinas e ácido ciclopiazônico por cepas de Aspergillus flavus isoladas de amendoim

Production of aflatoxin and cyclopiazonic acid by Aspergillus flavus strains isolate from peanuts

Edlayne Gonçalez Janaina Lara da Silva Tatiana Alves dos Reis Viviane Kobushi Nakai Joana D'Arc Felicio Benedito Corrêa Sobre os autores

Resumos

Aspergillus flavus é um fungo filamentoso que pode produzir aflatoxinas e ácido ciclopiazônico, sendo que a presença dessas micotoxinas em alimentos e rações pode levar a um efeito tóxico no homem e em animais. Cepas de A. flavus produtoras de aflatoxinas e ácido ciclopiazônico são frequentemente isoladas do amendoim, indicando a natural co-ocorrência dessas toxinas neste substrato. Neste estudo, foram isoladas 47 cepas de Aspergillus flavus em grãos e cascas de amendoim durante diferentes fases de maturação do fruto e também durante seu armazenamento. Das cepas isoladas, foram avaliados os potenciais para produção de aflatoxinas e ácido ciclopiazônico, em que 91,5% foram produtoras de aflatoxinas e 70% produziram ácido ciclopiazônico, sendo que 63,8% produziram ambas as toxinas e 2,1% não produziu nenhuma. A presença de cepas toxigênicas de A. flavus nas amostras de amendoim analisadas indica um risco potencial da contaminação deste produto, caso seja exposto a condições ambientais favoráveis ao crescimento do fungo e produção de micotoxinas.

micotoxinas; fungos toxigênico; produção de micotoxinas; ocorrência


Aspergillus flavus is a filamentous fungus that can produce aflatoxins and cyclopiazonic acid, and the presence of these mycotoxins in food and feed can lead to a toxic effect on humans and animals. Strains of A. flavus producing aflatoxin and cyclopiazonic acid are often isolated from peanuts, indicating the the co-occcurrence of these toxins in the natural substrate. In this study, we isolated 47 strains of A. flavus on peanut kernels and hulls during different stages of fruit ripening and its storage. Of the isolated strains, we assessed the potential for aflatoxin and cyclopiazonic acid production, in which 91.5% could produce aflatoxins and 70% produced cyclopiazonic acid; 63.8% produced both toxins and 2.1% produced no toxin. The presence of toxigenic A. flavus strains in peanut samples indicate a potential risk of contamination of these products, if they are exposed to environmental conditions that are favorable to fungal growth and mycotoxin production.

mycotoxins; toxigenic fungi; mycotoxin production; occcurrence


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Datas de Publicação

  • Publicação nesta coleção
    07 Jul 2015
  • Data do Fascículo
    Set 2013

Histórico

  • Recebido
    02 Dez 2011
  • Aceito
    08 Ago 2013
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